Comparison

FIRE Cat vs Instant Compound Calc!

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

FIRE Cat

Features
Read full description

What does $10 a day become in 20 years? If a crash like 2008 hits right after you start, should you stop? How big a portfolio pays $1,000 a month in dividends, and how long will it take? FIRE Cat answers with real market history and a clear range — then keeps you company as you get a little closer to your goal every day. REAL MARKET BACKTESTS • US large caps with dividends, monthly since 1871 — start from any year • Daily, weekly or monthly investing • Annual return, max drawdown, worst year and biggest paper loss in one view • Plain answers like "In Feb 2009 the market was down 45%. If you kept going, you'd have…" SMART RANGE FORECASTS • Low, middle and high projections for daily, weekly or monthly investing • US large caps use the real spread of past returns over the same number of years • Assumed returns for US tech, global stocks, high dividend, gold and bitcoin — all editable • See the formula and a year-by-year table DIVIDEND PLANNER • Enter the monthly income you want, the yield and how much you invest a day • See the portfolio you need and about how long it takes • Reinvest dividends on or off, with yearly dividend bars STEADY PROGRESS • Set your plan once; FIRE Cat adds it up and estimates your balance every day • Update your real balance whenever you like, by account if you want — no bank or broker login • Record extra deposits, withdrawals, pauses and changes; compare plan and actual on one chart • See how long until your goal, and whether you're ahead of plan LOCK SCREEN WIDGETS • Lock Screen, small and medium Home Screen widgets • Time to goal, days invested and today's estimated balance • Updates every day without opening the app FREE AND PRO • Every calculation, backtest, dividend plan, progress view and widget is free — nothing is locked • The free version shows a banner under results; no video ads • Pro is a one-time purchase that removes all ads. Not a subscription PRIVACY • No account, no bank or broker connection • Your data stays on your iPhone and can be backed up to your own iCloud Data: US large-cap history calculated from Robert J. Shiller, Online Data. All results are hypothetical and for education only. Past performance does not guarantee future results. Fees, taxes and currency exchange are not included. Not investment advice. FIRE Cat is not affiliated with any index provider.

About

Instant Compound Calc!

Features
Read full description

A simple yet powerful compound interest calculator that computes complex calculations instantly! With easy operation, it displays highly accurate results. <App Features> 1. Simple and intuitive UI: Just input principal, annual rate, and years elapsed for easy compound interest calculation. The visually clear design ensures even first-time users can use it confidently. 2. Lightning-fast calculation: Tap the "Calculate" button after input to instantly view results. See the power of compound interest right away. 3. Clear results display: Results appear in large, easy-to-read fonts. Check principal plus interest and interest amounts for each year in detail. 4. User-friendly input keyboard: Optimized numeric keyboard with easy close button for smooth input. 5. Error prevention: Detects invalid inputs and shows error messages. Ensures accurate calculations with peace of mind. <Recommended For> * Investors (beginner to advanced): Simulate investment growth for future planning * Household managers: Understand savings and investment effects concretely * Educators: Use as a financial education tool for students * Economics learners: Learn compound interest concepts hands-on <Compound Interest Formula> * Total Amount = Principal × (1 + Annual Rate/100) ^ Years Elapsed Simple operation for precise compound interest calculations, anytime anywhere. Your essential tool for asset building! Paid app with no ads whatsoever.

Screenshots

FIRE Cat4 screens
Instant Compound Calc!3 screens

Verdict

The call

The clearest difference is price: FIRE Cat at Free against Instant Compound Calc!'s $2.99. Instant Compound Calc!'s advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

FIRE Cat is free to download; Instant Compound Calc! costs $2.99 up front. FIRE Cat sells 1 one-off in-app purchase. Instant Compound Calc! asks for nothing beyond the download.

UpkeepUpdate frequency

FIRE Cat ships an update every 25 months, Instant Compound Calc! every 2 months. The most recent releases landed on November 12, 2026 and November 8, 2026 respectively.

Scorecard5 real differences · 1 level
FIRE Cat versus Instant Compound Calc!: the parameters behind the verdict, then further details
ParameterFIRE CatInstant Compound Calc!
PriceFree — better$2.99
Update frequencyEvery 25 monthsEvery 2 months — better
AdsYesNo — better
In-app purchasesYesNo — better
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.017.6 — better
Further details — not scored
Size13 MB7 MB
Age rating4+4+
DeveloperRUI QIShun Isayama

In-app purchases

1 purchases

FIRE Cat

One-time1
  • Remove Ads$4.99
None

Instant Compound Calc!

No in-app purchases

Questions

Is FIRE Cat free?
FIRE Cat is free to download, with in-app purchases available.
Is Instant Compound Calc! free?
Instant Compound Calc! costs $2.99, with no in-app purchases.
Do FIRE Cat or Instant Compound Calc! have ads?
FIRE Cat shows ads; Instant Compound Calc! does not.
Which is updated more often, FIRE Cat or Instant Compound Calc!?
FIRE Cat ships an update every 25 months, and Instant Compound Calc! every 2 months. Most recently, FIRE Cat was updated on November 12, 2026 and Instant Compound Calc! on November 8, 2026.

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